Linear approximate conservation laws correspond to “pools” of species that are conserved by fast cycling
reactions. The exact and approximate linear conservation laws usually correspond to the total
number of copies of a certain type of molecule in the pool.
For instance, in Example REF , there
is an exact and an approximate linear conservation law corresponding to
the total numbers of enzyme and substrate molecules, respectively.
The fast part of the dynamics ends with the equilibration of all species in the fast pool. This state is named quasi-equilibrium (QE) [1]}.
